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| author | Richard Kenner <kenner@gcc.gnu.org> | 1993-12-29 06:51:45 -0500 |
|---|---|---|
| committer | Richard Kenner <kenner@gcc.gnu.org> | 1993-12-29 06:51:45 -0500 |
| commit | c407b802da69a55de221f446243e2de9ed6f4203 (patch) | |
| tree | 77fc3143230cb78a97d971c0fa76bc121556ae32 | |
| parent | bb7c21a564da5e0fbc1ab4cc3bf3702b232dd3e6 (diff) | |
| download | gcc-c407b802da69a55de221f446243e2de9ed6f4203.zip gcc-c407b802da69a55de221f446243e2de9ed6f4203.tar.gz gcc-c407b802da69a55de221f446243e2de9ed6f4203.tar.bz2 | |
(simplify_binary_operation, case MULT): Don't convert to ASHIFT if
still generating RTL.
From-SVN: r6340
| -rw-r--r-- | gcc/cse.c | 8 |
1 files changed, 6 insertions, 2 deletions
@@ -648,6 +648,8 @@ static void cse_check_loop_start PROTO((rtx, rtx)); static void cse_set_around_loop PROTO((rtx, rtx, rtx)); static rtx cse_basic_block PROTO((rtx, rtx, struct branch_path *, int)); static void count_reg_usage PROTO((rtx, int *, rtx, int)); + +extern int rtx_equal_function_value_matters; /* Return an estimate of the cost of computing rtx X. One use is in cse, to decide which expression to keep in the hash table. @@ -3685,9 +3687,11 @@ simplify_binary_operation (code, mode, op0, op1) if (op1 == CONST1_RTX (mode)) return op0; - /* Convert multiply by constant power of two into shift. */ + /* Convert multiply by constant power of two into shift unless + we are still generating RTL. This test is a kludge. */ if (GET_CODE (op1) == CONST_INT - && (val = exact_log2 (INTVAL (op1))) >= 0) + && (val = exact_log2 (INTVAL (op1))) >= 0 + && ! rtx_equal_function_value_matters) return gen_rtx (ASHIFT, mode, op0, GEN_INT (val)); if (GET_CODE (op1) == CONST_DOUBLE |